Yes the FMS Data Manager is intended to take care of the distribution to multiple folders in multiple addons.
Let’s try an in between solution which should remember your settings.
In FMS Data Manager, Addon Mappings,
Press +Add,
For Please select an addon… Select Flightfactor Boeing 777v2,
For Install into… Choose User Defined Folder and Navigate to c:\X-Plane 12\Custom Data\STSFF\nav-data\ndbl\data
Press +Add,
For Please select an addon… Select X-Plane 12,
For Install into… Choose User Defined Folder and Navigate to c:\X-Plane 12\Custom Data
Press +Add,
For Please select an addon… Select X-Plane GNS430, FF757/767/777, X-Crafts Embraer E-175/195, Aerobask SkyView, JRollon Planes CRJ200, JARDesign A320/A330, ToLiss A319 (XP10), STMA Aircraft, Magknight 787AE,
For Install into… Choose User Defined Folder and Navigate to c:\X-Plane 12\Custom Data\GNS430
Repeat for each addon. If not sure please ask for specifics of addon.
Then Press Save
Ian